JP5524735B2 - Secondary battery electrode plate and secondary battery including the same - Google Patents
Secondary battery electrode plate and secondary battery including the same Download PDFInfo
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- JP5524735B2 JP5524735B2 JP2010147731A JP2010147731A JP5524735B2 JP 5524735 B2 JP5524735 B2 JP 5524735B2 JP 2010147731 A JP2010147731 A JP 2010147731A JP 2010147731 A JP2010147731 A JP 2010147731A JP 5524735 B2 JP5524735 B2 JP 5524735B2
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000733 Li alloy Inorganic materials 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/043—Processes of manufacture in general involving compressing or compaction
- H01M4/0435—Rolling or calendering
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/0471—Processes of manufacture in general involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/661—Metal or alloys, e.g. alloy coatings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M2004/021—Physical characteristics, e.g. porosity, surface area
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Secondary Cells (AREA)
- Cell Electrode Carriers And Collectors (AREA)
Description
本発明は、二次電池用電極板及びこれを含む二次電池に関する。 The present invention relates to an electrode plate for a secondary battery and a secondary battery including the same.
一般的な自動車は、ガソリンや軽油で動作するエンジンを動力源にする。しかし、環境汚染が世界的な問題となり、エンジンと共に電気モータを採用して、燃料使用量を減らし全体的なエネルギー消費効率を高めたハイブリッド自動車が業界で注目されている。 A general automobile uses an engine that operates on gasoline or light oil as a power source. However, environmental pollution has become a global problem, and hybrid cars that use electric motors together with engines to reduce fuel consumption and increase overall energy consumption efficiency are attracting attention in the industry.
ハイブリッド自動車のHEV(Hybrid Electric Vehicle)用電池は、化学エネルギーと電気エネルギーとの相互変換が可逆的で、充電と放電を繰り返すことができる。このようなHEV用電池は、正極と負極がセパレータ(separator)を介在させて位置する電極郡(electrode assembly)、電極郡が収容される空間を有するケース及び前記ケースに結合されてこれを密閉するキャッププレートなどを含む。 A hybrid vehicle HEV (Hybrid Electric Vehicle) battery has a reversible interconversion between chemical energy and electric energy, and can be repeatedly charged and discharged. Such a HEV battery has an electrode assembly in which a positive electrode and a negative electrode are disposed with a separator interposed therebetween, a case having a space in which the electrode group is accommodated, and the case to be sealed. Including cap plate.
そして、正極及び負極電極板は、それぞれ電流集電のための集電体と前記集電体に塗布された活物質を含む。前記電極板は、活物質がコーティングされたコーティング部と、コーティングされない無地部とからなる。このような電極板は、長く延長された帯形状を有し、長さ方向に両側または一側の端部に、活物質が塗布されない無地部を有する。そして、電極板の無地部には、導電性タブ(tab)がそれぞれ付着して、正極電極板または負極電極板で発生した電流をそれぞれ正極端子または負極端子に誘導する。コーティング部は、活物質が塗布された後、乾燥及び圧延などにより形成される。電極板のコーティング部は、活物質によって、無地部に比べてもっと厚いので、電極板を圧延する際に高圧力の印加により大いに延伸される。しかし、電極板の無地部は、電極板を圧延する際に圧力が殆ど印加されないので延伸されない。 The positive electrode and the negative electrode plate each include a current collector for collecting current and an active material applied to the current collector. The electrode plate includes a coating portion coated with an active material and a plain portion not coated. Such an electrode plate has a long and elongated band shape, and has a solid portion to which no active material is applied at both ends or one end in the length direction. And the conductive tab (tab) adheres to the plain part of the electrode plate, respectively, and induces the current generated in the positive electrode plate or the negative electrode plate to the positive electrode terminal or the negative electrode terminal, respectively. The coating part is formed by drying and rolling after the active material is applied. Since the coating part of the electrode plate is thicker than the plain part due to the active material, it is greatly stretched by applying a high pressure when rolling the electrode plate. However, the plain portion of the electrode plate is not stretched because almost no pressure is applied when the electrode plate is rolled.
即ち、電極板のコーティング部と無地部に印加される圧力差によって発生した延伸差により、電極板が撓む湾曲現象または撓み現像が発生する。このような湾曲現象または撓み現像は、電池の寿命を短縮させ、自動車を駆動するための十分な出力を得ることができなくなり、内部ショート現象を発生させる。 That is, a bending phenomenon or bending development in which the electrode plate bends due to a stretching difference generated by a pressure difference applied to the coating portion and the plain portion of the electrode plate. Such bending phenomenon or bending development shortens the battery life, makes it impossible to obtain a sufficient output for driving the automobile, and causes an internal short-circuit phenomenon.
そこで、本発明は、上記問題に鑑みてなされたものであり、本発明の目的とするところは、二次電池の電極板の圧延工程時、活物質が塗布されたコーティング部と無地部の厚さ差によって、印加される圧力が異なって発生する湾曲現象及び撓み現像を改善することが可能な、新規かつ改良された二次電池用電極板及びこれを含む二次電池を提供することにある。 Accordingly, the present invention has been made in view of the above problems, and an object of the present invention is to provide a thickness of the coating portion and the plain portion to which the active material is applied during the rolling process of the electrode plate of the secondary battery. It is an object to provide a new and improved electrode plate for a secondary battery and a secondary battery including the same, which are capable of improving the bending phenomenon and the bending development caused by the difference in applied pressure. .
上記課題を解決するために、本発明のある観点によれば、帯形状に形成され、活物質が部分的に塗布された集電体からなる電極板であって、前記集電体は、一面に前記活物質が塗布されたコーティング部;及び前記コーティング部の長さ方向に沿って前記コーティング部の一側または両側に形成され、少なくとも四つの結晶方向を有する無地部を含む二次電池用電極板が提供される。 In order to solve the above problems, according to an aspect of the present invention, there is provided an electrode plate formed of a current collector formed in a strip shape and partially coated with an active material. An electrode for a secondary battery comprising: a coating portion coated with the active material; and a plain portion formed on one or both sides of the coating portion along the length direction of the coating portion and having at least four crystal directions A board is provided.
ここで、X線回折分析時、前記コーティング部のピーク値が最も大きい結晶方向のピーク値に対する前記ピーク値が二番目に大きい結晶方向のピーク値の比は、0.256乃至0.741であってもよい。 Here, during X-ray diffraction analysis, the ratio of the peak value in the crystal direction where the peak value is the second largest to the peak value in the crystal direction where the peak value of the coating portion is the largest is 0.256 to 0.741. May be.
そして、X線回折分析時、前記コーティング部のピーク値が最も大きい結晶方向のピーク値に対するピーク値が四番目に大きい結晶方向のピーク値の比は、0.051乃至0.222であってもよい。 In the X-ray diffraction analysis, the ratio of the peak value in the crystal direction with the fourth highest peak value to the peak value in the crystal direction with the largest peak value in the coating portion may be 0.051 to 0.222. Good.
また、前記無地部は、(111)結晶方向、(200)結晶方向、(220)結晶方向及び(311)結晶方向を含んで形成されてもよい。 The plain portion may be formed including a (111) crystal direction, a (200) crystal direction, a (220) crystal direction, and a (311) crystal direction.
また、前記無地部は、前記(220)結晶方向で最も大きいピーク値を有してもよい。 The plain portion may have the largest peak value in the (220) crystal direction.
また、前記無地部は、前記(220)結晶方向でのピーク値に対する前記(311)結晶方向でのピーク値の比が0.412より大きくて0.741以下であってもよい。 The ratio of the peak value in the (311) crystal direction to the peak value in the (220) crystal direction may be greater than 0.412 and 0.741 or less.
前記無地部は、前記(220)結晶方向でのピーク値に対する前記(111)結晶方向でのピーク値の比が0.051乃至0.222であってもよい。 In the plain portion, a ratio of a peak value in the (111) crystal direction to a peak value in the (220) crystal direction may be 0.051 to 0.222.
また、前記無地部は、延伸率が100%乃至120%であってもよい。 The plain portion may have a stretching ratio of 100% to 120%.
また、前記無地部は、引張強度が2[N]乃至3[N]であってもよい。 The plain portion may have a tensile strength of 2 [N] to 3 [N].
また、前記無地部は、誘導加熱されて形成されてもよい。 Further, the plain portion may be formed by induction heating.
また、前記集電体は、圧延工程後、極板撓み偏差が1[mm]以下であってもよい。 The current collector may have an electrode plate deflection deviation of 1 [mm] or less after the rolling step.
また、前記無地部は誘導加熱され、前記誘導加熱のための誘導加熱装置は、活物質コーティング部と無地部を有する電極板を巻き出す巻出ローラ;前記電極板を移送するガイドローラ;前記ガイドローラから移送された前記電極板の無地部を誘導加熱する誘導加熱部;及び前記ガイドローラから移送される前記電極板を巻き取る巻取ローラを含んでなってもよい。 The plain portion is induction-heated, and the induction heating device for the induction heating includes an unwinding roller for unwinding an electrode plate having an active material coating portion and a plain portion; a guide roller for transferring the electrode plate; An induction heating unit that induction-heats the plain portion of the electrode plate transferred from the roller; and a winding roller that winds up the electrode plate transferred from the guide roller.
前記誘導加熱部は、前記無地部の少なくとも一側面をワークコイルを介して誘導加熱してもよい。 The induction heating unit may induction-heat at least one side surface of the plain portion via a work coil.
また、上記課題を解決するために、本発明の別の観点によれば、正極板、負極板及び前記正極板と負極板の間に位置するセパレータがジェリーロールの形状に巻回される電極組立体を含む二次電池であって、前記正極板または負極板のうち選択された少なくとも何れか一つは、上記の何れか一つにかかる電極板で形成された二次電池が提供される。 In order to solve the above problems, according to another aspect of the present invention, there is provided an electrode assembly in which a positive electrode plate, a negative electrode plate, and a separator positioned between the positive electrode plate and the negative electrode plate are wound in the shape of a jelly roll. A secondary battery is provided in which at least one selected from the positive electrode plate and the negative electrode plate is formed of the electrode plate according to any one of the above.
本発明に係る二次電池用電極板によれば、電極板の無地部を誘導加熱して、無地部の結晶粒が多方向性を有するように物性を変化させ、延伸率を増加させることで、電極板を圧延する際に、活物質が塗布されたコーティング部とコーティングされない無地部の厚さ差によって発生する湾曲現象を改善することができる。 According to the electrode plate for a secondary battery according to the present invention, the plain portion of the electrode plate is induction-heated, the physical properties are changed so that the crystal grains of the plain portion have multi-directionality, and the stretch ratio is increased. When rolling the electrode plate, it is possible to improve the bending phenomenon caused by the difference in thickness between the coated portion where the active material is applied and the uncoated plain portion.
また、本発明に係る二次電池用電極板を含む二次電池によれば、二次電池の寿命が増加させ、電極組立体の屈曲による内部ショート現象が防止されることができる。 Moreover, according to the secondary battery including the electrode plate for a secondary battery according to the present invention, the life of the secondary battery can be increased, and an internal short-circuit phenomenon due to bending of the electrode assembly can be prevented.
以下に添付図面を参照しながら、本発明の好適な実施の形態について詳細に説明する。なお、本明細書及び図面において、実質的に同一の機能構成を有する構成要素については、同一の符号を付することにより重複説明を省略する。 Exemplary embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In addition, in this specification and drawing, about the component which has the substantially same function structure, duplication description is abbreviate | omitted by attaching | subjecting the same code | symbol.
図1には、本発明の実施例にかかる二次電池用電極板の斜視図が図示されている。図1に示すように、電極板10は、集電体11及び活物質12を含む。前記集電体11は、一方向に長く延長された帯形状を有することができる。前記集電体11は、アルミニウム(Al)からなる正極集電体と銅(Cu)からなる負極集電体のうち一つであり得る。前記集電体11は、活物質が塗布されたコーティング部11aと活物質が塗布されない無地部11bとを含む。前記コーティング部11aは、集電体11の長さ方向に沿って所定幅を有するように延長形成される。前記無地部11bは、集電体11の長さ方向に沿って前記コーティング部11aの両側に形成されてもよく、前記コーティング部11aの一側にのみ形成されてもよい。 FIG. 1 is a perspective view of an electrode plate for a secondary battery according to an embodiment of the present invention. As shown in FIG. 1, the electrode plate 10 includes a current collector 11 and an active material 12. The current collector 11 may have a strip shape extending in one direction. The current collector 11 may be one of a positive electrode current collector made of aluminum (Al) and a negative electrode current collector made of copper (Cu). The current collector 11 includes a coating part 11a to which an active material is applied and a plain part 11b to which no active material is applied. The coating part 11 a is extended and formed to have a predetermined width along the length direction of the current collector 11. The plain portion 11b may be formed on both sides of the coating portion 11a along the length direction of the current collector 11, or may be formed only on one side of the coating portion 11a.
前記活物質12は、集電体11の前記無地部11bを除いた中心領域に長さ方向に沿って塗布されることができる。前記活物質12は、正極活物質として、リチウムコバルト酸化物(LiCoO2)、リチウム二酸化マンガン(LiMnO2)またはリチウムニッケル二酸化物(LiNiO2)などのリチウム合金からなることができる。そして、前記活物質12は、負極活物質として、炭素、黒鉛及びこれらの組合からなるグループから選択された少なくとも一つまたはこれらの組合からなってもよい。 The active material 12 may be applied along the length direction in a central region of the current collector 11 excluding the plain portion 11b. The active material 12 may be made of a lithium alloy such as lithium cobalt oxide (LiCoO 2 ), lithium manganese dioxide (LiMnO 2 ), or lithium nickel dioxide (LiNiO 2 ) as a positive electrode active material. The active material 12 may include at least one selected from the group consisting of carbon, graphite, and a combination thereof as a negative electrode active material, or a combination thereof.
前記電極板10は、前記コーティング部11aに前記活物質12が塗布され、後述する誘導加熱装置(100、図2a乃至図2d参照)を利用して前記無地部11bが誘導加熱された後、前記電極板10が圧延手段により加圧されることで形成されることができる。前記電極板10の無地部11bが誘導加熱装置を利用して誘導加熱されると、集電体の成分が変化して、圧延の際に圧力差によって発生する湾曲現象が改善されることができる。 In the electrode plate 10, the active material 12 is applied to the coating portion 11a, and the plain portion 11b is induction-heated using an induction heating device (100, see FIGS. 2a to 2d), which will be described later. The electrode plate 10 can be formed by being pressed by rolling means. When the plain portion 11b of the electrode plate 10 is induction-heated using an induction heating device, the current collector component changes, and the bending phenomenon caused by the pressure difference during rolling can be improved. .
以下では、本実施形態にかかる二次電池に使用される電極板を誘導加熱するための誘導加熱装置の構成を説明する。 Below, the structure of the induction heating apparatus for induction heating the electrode plate used for the secondary battery concerning this embodiment is demonstrated.
図2aは、本発明の実施例にかかる二次電池用電極板を製造するための誘導加熱装置の部分斜視図である。図2bは、図2aのA部分拡大図である。図2cは、図2bの概略図である。図2dは、図2bのB‐B’線断面図である。 FIG. 2A is a partial perspective view of an induction heating apparatus for manufacturing a secondary battery electrode plate according to an embodiment of the present invention. FIG. 2b is an enlarged view of part A of FIG. 2a. FIG. 2c is a schematic diagram of FIG. 2b. 2d is a cross-sectional view taken along line B-B 'of FIG. 2b.
図2a乃至図2dを参照すると、前記誘導加熱装置100は、巻出ローラ110、ガイドローラ120、移送ローラ130、誘導加熱部140、巻取ローラ150、吸入部160、冷却部170及びダミーローラ180を含むことができる。 Referring to FIGS. 2a to 2d, the induction heating apparatus 100 includes an unwinding roller 110, a guide roller 120, a transfer roller 130, an induction heating unit 140, a winding roller 150, a suction unit 160, a cooling unit 170, and a dummy roller 180. Can be included.
前記巻出ローラ110は、前記電極板10を巻き出すために、円筒形状を有することができる。ここで、前記巻出ローラ110は、前記電極板10と接触した状態で回転軸を中心に回転して、前記電極板10を巻き出す。前記巻出ローラ110は、回転軸に連結されたモータ(図示せず)から駆動力を印加されて、前記電極板10を巻き出すことができる。そして、前記巻出ローラ110は、前記ガイドローラ120を介して前記誘導加熱部140に前記電極板10を巻き出す。 The unwinding roller 110 may have a cylindrical shape for unwinding the electrode plate 10. Here, the unwinding roller 110 rotates around the rotation axis in contact with the electrode plate 10 to unwind the electrode plate 10. The unwinding roller 110 can unwind the electrode plate 10 by applying a driving force from a motor (not shown) connected to a rotating shaft. The unwinding roller 110 unwinds the electrode plate 10 to the induction heating unit 140 through the guide roller 120.
前記ガイドローラ120は、円筒形状を有し、前記巻出ローラ110から伝達された前記電極板10を移送する。前記ガイドローラ120は、前記電極板10の移送を容易にするために、前記電極板10の幅より多少広い幅を有するように形成されることができる。 The guide roller 120 has a cylindrical shape and transfers the electrode plate 10 transmitted from the unwinding roller 110. The guide roller 120 may be formed to have a width that is slightly wider than the width of the electrode plate 10 in order to facilitate the transfer of the electrode plate 10.
前記ガイドローラ120は、非熱伝導性材質からなることができ、好ましく、テフロン(登録商標)(teflon)などを含む耐熱性、非伝導性、耐磨耗性を有する物質からなることができる。前記テフロンは、熱に強い合成樹脂であって、誘導加熱による高熱にも変形されない。また、前記テフロンは、表面が滑らかで摩擦に強いので、摩擦による騒音を抑制することができ、汚染物質が付着し難い。 The guide roller 120 may be made of a non-thermally conductive material, and may be made of a material having heat resistance, non-conductivity, and wear resistance including Teflon (registered trademark). The Teflon is a heat-resistant synthetic resin, and is not deformed by high heat by induction heating. Further, since the Teflon has a smooth surface and is resistant to friction, noise due to friction can be suppressed, and contaminants hardly adhere.
前記ガイドローラ120の回転軸は、前記巻出ローラ110の回転軸と平行に形成され、前記ガイドローラ120には、前記巻出ローラ110から前記電極板10が水平に伝達されることができる。また、前記ガイドローラ120は、回転軸を中心に回転して、表面に接触した前記電極板10を移送することができる。 The rotation axis of the guide roller 120 is formed in parallel with the rotation axis of the unwinding roller 110, and the electrode plate 10 can be horizontally transmitted from the unwinding roller 110 to the guide roller 120. Further, the guide roller 120 can rotate around the rotation axis to transfer the electrode plate 10 in contact with the surface.
前記移送ローラ130は、円筒形状を有し、前記ガイドローラ120から伝達された前記電極板10を移送する。前記移送ローラ130の回転軸は、前記ガイドローラ120の回転軸と平行に形成され、前記移送ローラ130には、前記ガイドローラ120から前記電極板10が水平に伝達されることができる。 The transfer roller 130 has a cylindrical shape and transfers the electrode plate 10 transmitted from the guide roller 120. The rotation axis of the transfer roller 130 is formed in parallel with the rotation axis of the guide roller 120, and the electrode plate 10 can be horizontally transmitted from the guide roller 120 to the transfer roller 130.
この時、前記ガイドローラ120の上面から接線方向に水平に延長された延長平面Aと前記ガイドローラ120の上面と前記移送ローラ130の上面を連結した仮想平面Bが成す角度θ1は、−20乃至0を成すことが好ましい。前記延長平面Aと前記仮想平面Bが成す角度θ1が−20以上であると、前記ガイドローラ120と接する前記電極板10の面積を減少させて、前記電極板10に加えられた熱が前記ガイドローラ120に伝達されることを防止することができる。また、前記延長平面Aと前記仮想平面Bが成す角度θ1が0以下であると、誘導加熱された前記電極板10の撓み現像を改善して、前記電極板10を支持することができる。即ち、前記移送ローラ130は、前記ガイドローラ120と略平行になるように装着され、誘導加熱の際に前記電極板10から前記ガイドローラ120に伝達される熱を最小化することができる。 At this time, an angle θ1 formed by an extended plane A extending horizontally in a tangential direction from the upper surface of the guide roller 120, an imaginary plane B connecting the upper surface of the guide roller 120 and the upper surface of the transfer roller 130 is −20 to It is preferably 0. When the angle θ1 formed by the extension plane A and the virtual plane B is −20 or more, the area of the electrode plate 10 in contact with the guide roller 120 is reduced, and the heat applied to the electrode plate 10 is reduced by the guide. Transmission to the roller 120 can be prevented. Further, when the angle θ1 formed by the extended plane A and the virtual plane B is 0 or less, the bending development of the electrode plate 10 that is induction-heated can be improved and the electrode plate 10 can be supported. That is, the transfer roller 130 is mounted so as to be substantially parallel to the guide roller 120, and heat transmitted from the electrode plate 10 to the guide roller 120 during induction heating can be minimized.
前記誘導加熱部140は、前記電極板10の無地部11bを誘導加熱するためのワークコイル141を含む。前記ワークコイル141は、前記無地部11bの幅waと対応する幅wbに形成されることができ、熱伝導率の高い金属からなることができる。前記誘導加熱部140は、前記ガイドローラ120の上部に位置する。即ち、前記誘導加熱部140の下部に前記ガイドローラ120を介して前記電極板10が移送される。よって、前記電極板10の移送中、前記ワークコイル141は前記無地部11bを誘導加熱する。 The induction heating unit 140 includes a work coil 141 for induction heating the plain portion 11 b of the electrode plate 10. The work coil 141 may be formed in a width wb corresponding to the width wa of the plain portion 11b and may be made of a metal having high thermal conductivity. The induction heating unit 140 is located above the guide roller 120. That is, the electrode plate 10 is transferred to the lower part of the induction heating unit 140 through the guide roller 120. Therefore, during the transfer of the electrode plate 10, the work coil 141 inductively heats the plain portion 11b.
前記誘導加熱部140は、前記電極板10の無地部11bが形成された一側と対応するように具備されることができる。また、前記誘導加熱部140は、前記電極板10の無地部11bが形成された両側と対応するように、互いにそれぞれ離隔して対向する複数個が具備されることもできる。そして、複数個の前記誘導加熱部140は、前記無地部11bの離隔距離wcと対応するように離隔することができる。 The induction heating unit 140 may be provided so as to correspond to one side of the electrode plate 10 where the plain portion 11b is formed. In addition, the induction heating unit 140 may include a plurality of induction heating units 140 that are spaced apart from each other so as to correspond to both sides of the electrode plate 10 where the plain portions 11b are formed. The plurality of induction heating units 140 can be separated to correspond to the separation distance wc of the plain portion 11b.
前記誘導加熱部140は、前記電極板10の無地部11bを誘導加熱して、前記集電体11の内部で自発熱が生成されるようにすることで、前記集電体11の物性を変化させることができる。また、前記誘導加熱部140は、ワークコイル141を介して前記無地部11bを誘導加熱するので、1秒乃至3秒程度の比較的短い時間でも十分な熱処理(full−annealing)ができる。また、前記電極板10の無地部11bは、誘導加熱により結晶粒が変わって強度が変わるので、圧延する時に前記コーティング部11aと無地部11bに印加される圧力差が解消されることができる。即ち、前記電極板10は、ワークコイル141を介して前記無地部11bのみ誘導加熱されるので、電極板10を圧延する時にコーティング部11aと無地部11bの間の延伸偏差により極板が撓む湾曲現象及び撓み現像を防止することができる。 The induction heating unit 140 changes the physical properties of the current collector 11 by induction heating the plain portion 11b of the electrode plate 10 so that self-heating is generated inside the current collector 11. Can be made. In addition, since the induction heating unit 140 induction-heats the plain portion 11b via the work coil 141, sufficient heat treatment (full-annealing) can be performed even in a relatively short time of about 1 to 3 seconds. Further, since the strength of the plain portion 11b of the electrode plate 10 is changed due to induction heating, the pressure difference applied to the coating portion 11a and the plain portion 11b during rolling can be eliminated. That is, since the electrode plate 10 is induction-heated only via the work coil 141, the electrode plate bends due to a stretching deviation between the coating portion 11a and the plain portion 11b when the electrode plate 10 is rolled. It is possible to prevent the bending phenomenon and the bending development.
前記巻取ローラ150は、円筒形状を有し、前記移送ローラ130から伝達された前記電極板10を移送する。前記巻取ローラ150は、前記電極板10と接触した状態で回転軸を中心に回転して、前記電極板10を巻き取る。前記巻取ローラ150の回転軸は前記移送ローラ130の回転軸と平行に位置して、前記移送ローラ130から前記電極板10が水平に伝達されることができる。前記巻取ローラ150の回転軸は、モータ(図示せず)に連結され、回転力の印加を受けて、前記電極板10を巻き取ることができる。 The winding roller 150 has a cylindrical shape and transfers the electrode plate 10 transmitted from the transfer roller 130. The winding roller 150 rotates around a rotation shaft in contact with the electrode plate 10 to wind the electrode plate 10. A rotation shaft of the winding roller 150 is positioned in parallel with a rotation shaft of the transfer roller 130, and the electrode plate 10 can be transmitted horizontally from the transfer roller 130. The rotating shaft of the winding roller 150 is connected to a motor (not shown), and can receive the rotational force to wind the electrode plate 10.
前記吸入部160としては、ダクト(duct)及びファンなどを具備する一般的な吸入部を使用することができる。前記吸入部160は、前記巻出ローラ110と前記誘導加熱部140の間に設けられ、前記電極板10に存在する有機物を吸入する。即ち、前記吸入部160は、前記電極板10が前記誘導加熱部140に移送される前に、前記電極板10の表面に残留する有機物を吸入する。よって、前記電極板10が誘導加熱部140を介して誘導加熱される時、前記無地部11bの各領域が均一に熱処理されることができる。 The suction part 160 may be a general suction part including a duct and a fan. The suction part 160 is provided between the unwinding roller 110 and the induction heating part 140 and sucks organic matter present in the electrode plate 10. That is, the suction unit 160 sucks organic matter remaining on the surface of the electrode plate 10 before the electrode plate 10 is transferred to the induction heating unit 140. Therefore, when the electrode plate 10 is induction-heated via the induction heating unit 140, each region of the plain portion 11b can be uniformly heat-treated.
前記冷却部170は、一般的な空気ポンプやファンなどの送風手段を利用して、前記電極板10を冷却することができる。前記冷却部170は、前記誘導加熱部140と前記巻取ローラ150の間に設けられ、誘導加熱された前記電極板10を冷却することができる。ここで、前記冷却部170は、図2cを参照すると、前記電極板10の上部に装着されて前記電極板10の上面のみを冷却するよう図示されているが、前記電極板10の下部にも形成されて前記電極板10の上下面を冷却することもできる。よって、前記冷却部170は、加熱された前記電極板10を冷却し、前記電極板10に残留する揮発成分を乾燥させることができる。 The cooling unit 170 may cool the electrode plate 10 using a blower such as a general air pump or a fan. The cooling unit 170 is provided between the induction heating unit 140 and the winding roller 150, and can cool the electrode plate 10 that has been induction heated. Here, referring to FIG. 2 c, the cooling unit 170 is mounted on the electrode plate 10 to cool only the upper surface of the electrode plate 10. The upper and lower surfaces of the electrode plate 10 formed may be cooled. Therefore, the cooling unit 170 can cool the heated electrode plate 10 and dry volatile components remaining on the electrode plate 10.
また、前記冷却部170は、前記誘導加熱部140と最大限密接に形成されて、誘導加熱された前記電極板10の冷却速度を向上させ、前記ガイドローラ120に熱が伝達されて前記ガイドローラ120が変形されることを防止することができる。 In addition, the cooling unit 170 is formed as closely as possible to the induction heating unit 140 to improve the cooling rate of the induction heated electrode plate 10, and heat is transmitted to the guide roller 120 so that the guide roller is heated. It is possible to prevent 120 from being deformed.
前記ダミーローラ180は、通常、前記電極板10の移送を容易にするために、円筒形状に具備されることができる。前記ダミーローラ180は、前記巻出ローラ110と前記ガイドローラ120の間に形成された前方ダミーローラ181、182、及び前記ガイドローラ120と前記巻取ローラ150の間に形成された後方ダミーローラ183を含むことができる。 In general, the dummy roller 180 may be formed in a cylindrical shape to facilitate the transfer of the electrode plate 10. The dummy roller 180 includes front dummy rollers 181 and 182 formed between the unwinding roller 110 and the guide roller 120, and a rear dummy roller 183 formed between the guide roller 120 and the winding roller 150. Can be included.
前記前方ダミーローラ181、182は、前記巻出ローラ110と前記吸入部160の間に形成された第1前方ダミーローラ181、及び前記第1前方ダミーローラ181と前記ガイドローラ120の間に形成された第2前方ダミーローラ182からなる。そして、前記前方ダミーローラ181、182は、前記ガイドローラ120と前記巻出ローラ110の間で、前記ガイドローラ120の下部に形成されることができる。前記後方ダミーローラ183は、前記移送ローラ130と前記巻取ローラ150の間で、前記移送ローラ130の下部に形成されることができる。 The front dummy rollers 181 and 182 are formed between a first front dummy roller 181 formed between the unwinding roller 110 and the suction portion 160, and between the first front dummy roller 181 and the guide roller 120. And a second front dummy roller 182. The front dummy rollers 181 and 182 may be formed below the guide roller 120 between the guide roller 120 and the unwinding roller 110. The rear dummy roller 183 may be formed below the transfer roller 130 between the transfer roller 130 and the winding roller 150.
前記ダミーローラ180は、前記巻出ローラ110と前記ガイドローラ120の間及び前記ガイドローラ120と前記巻取ローラ150の間で、前記電極板10に張力を提供する。また、前記ダミーローラ180は、前記電極板10にクラックが発生したり電極板か折れることを防止する。 The dummy roller 180 provides tension to the electrode plate 10 between the unwinding roller 110 and the guide roller 120 and between the guide roller 120 and the winding roller 150. Further, the dummy roller 180 prevents the electrode plate 10 from cracking or breaking the electrode plate.
以下では、本発明の実施例にかかる二次電池用電極板の誘導加熱による特性変化を説明する。 Below, the characteristic change by the induction heating of the electrode plate for secondary batteries concerning the Example of this invention is demonstrated.
図3a乃至図3cは、本発明の実施例にかかる二次電池用電極板の集電体をX線回折分析した結果を比較例と共に図示したグラフである。 3A to 3C are graphs illustrating the results of X-ray diffraction analysis of the current collector of the electrode plate for a secondary battery according to the example of the present invention, together with a comparative example.
図3aは、無地部が加熱されない(Non Annealing、NA)二次電池用電極板の集電体をX線回折分析した結果を図示したグラフである。そして、アルミニウムからなる5個の正極集電体(NA_1乃至NA_5)から結果をそれぞれ測定した。 FIG. 3A is a graph illustrating a result of X-ray diffraction analysis of a current collector of a secondary battery electrode plate in which a plain portion is not heated (Non Annealing, NA). The results were measured from five positive electrode current collectors (NA_1 to NA_5) made of aluminum.
前記加熱されない無地部のX線回折分析結果によると、前記無地部では主に(220)結晶方向と(311)結晶方向が検出される。即ち、前記無地部は、(220)結晶方向を有するグレイン(grain)と(311)結晶方向を有するグレインからなることが分かる。前記(220)結晶方向は、X線回折分析器の2θ値が約65である地点で発見される結晶方向である。一方、前記(311)結晶方向は、X線回折分析器の2θ値が約78である地点で発見される結晶方向である。即ち、加熱されない無地部は、X線回折分析結果を通じて(220)と(311)の結晶方向が検出される。 According to the result of X-ray diffraction analysis of the unheated plain part, the (220) crystal direction and (311) crystal direction are mainly detected in the plain part. That is, it can be seen that the plain portion is composed of grains having a (220) crystal direction and grains having a (311) crystal direction. The (220) crystal direction is a crystal direction found at a point where the 2θ value of the X-ray diffraction analyzer is about 65. On the other hand, the (311) crystal direction is a crystal direction found at a point where the 2θ value of the X-ray diffraction analyzer is about 78. That is, in the plain portion that is not heated, the crystal directions (220) and (311) are detected through the X-ray diffraction analysis result.
図3bは、無地部が輻射加熱された(Radiation Heating Annealing、RHA)二次電池用電極板の集電体をX線回折分析した結果を図示したグラフである。輻射加熱も、アルミニウムからなる5個の正極集電体(RHA1乃至RHA5)から結果をそれぞれ測定した。 FIG. 3b is a graph illustrating a result of X-ray diffraction analysis of a current collector of a secondary battery electrode plate in which a plain portion is radiantly heated (Radiation Heating Annealing, RHA). The results of radiant heating were also measured from five positive electrode current collectors (RHA1 to RHA5) made of aluminum.
図3bを参照すると、輻射加熱された無地部11bのX線回折分析結果では、主に(200)結晶方向、(220)結晶方向及び(311)結晶方向が検出された。即ち、前記無地部は、(200)結晶方向を有するグレイン、(220)結晶方向を有するグレイン及び(311)結晶方向を有するグレインからなることが分かる。前記(200)結晶方向は、X線回折分析器の2θ値が約45である地点で発見される結晶方向である。そして、上述したように、前記(220)結晶方向及び(311)結晶方向は、X線回折分析器の2θ値が約65及び78である地点でそれぞれ発見される。グラフから分かるように、前記輻射加熱(RHA)された無地部11bは、X線回折分析結果、主な三つの結晶構造を有する。 Referring to FIG. 3b, in the result of X-ray diffraction analysis of the radiantly heated plain portion 11b, (200) crystal direction, (220) crystal direction, and (311) crystal direction were mainly detected. That is, it can be seen that the plain portion is composed of grains having a (200) crystal direction, grains having a (220) crystal direction, and grains having a (311) crystal direction. The (200) crystal direction is a crystal direction found at a point where the 2θ value of the X-ray diffraction analyzer is about 45. As described above, the (220) crystal direction and the (311) crystal direction are found at points where the 2θ values of the X-ray diffraction analyzer are about 65 and 78, respectively. As can be seen from the graph, the radiant heating (RHA) plain portion 11b has three main crystal structures as a result of X-ray diffraction analysis.
一方、図3cは、無地部が誘導加熱された(Induction Heating Annealing、IHA)本発明の実施例にかかる二次電池用電極板の集電体をX線回折分析した結果を図示したのグラフである。誘導加熱も、アルミニウムからなる5個の正極集電体(IHA1乃至IHA5)でから結果をそれぞれ測定した。 On the other hand, FIG. 3c is a graph showing the result of X-ray diffraction analysis of the current collector of the secondary battery electrode plate according to the embodiment of the present invention (Induction Heating Annealing, IHA). is there. The results of induction heating were also measured from five positive electrode current collectors (IHA1 to IHA5) made of aluminum.
誘導加熱(IHA)は、集電体11の無地部11bにのみ行われるので、コーティング部11aのX線回折分析結果は、図3aの加熱されない無地部のX線回折分析結果と同一である。 Since induction heating (IHA) is performed only on the plain portion 11b of the current collector 11, the X-ray diffraction analysis result of the coating portion 11a is the same as the X-ray diffraction analysis result of the non-heated plain portion of FIG. 3a.
一方、図3cを参照すると、誘導加熱された無地部11bのX線回折分析結果では、(111)結晶方向、(200)結晶方向、(220)結晶方向及び(311)結晶方向が検出された。即ち、前記無地部11bは、(111)結晶方向を有するグレイン、(200)結晶方向を有するグレイン、(220)結晶方向を有するグレイン及び(311)結晶方向を有するグレインからなることが分かる。即ち、前記誘導加熱(IHA)された無地部11bは、X線回折分析結果、主な四つの結晶構造を有する。 On the other hand, referring to FIG. 3c, in the result of X-ray diffraction analysis of the plain portion 11b heated by induction, (111) crystal direction, (200) crystal direction, (220) crystal direction and (311) crystal direction were detected. . That is, it can be seen that the plain portion 11b is composed of grains having a (111) crystal direction, grains having a (200) crystal direction, grains having a (220) crystal direction, and grains having a (311) crystal direction. That is, the induction heated (IHA) plain portion 11b has four main crystal structures as a result of X-ray diffraction analysis.
また、誘導加熱(IHA)された無地部11bは、(220)結晶方向のピーク値が最も大きく、(200)結晶方向、(311)結晶方向、(111)結晶方向の順番でピーク値が減少していることを確認できる。 In addition, the plain portion 11b subjected to induction heating (IHA) has the largest peak value in the (220) crystal direction, and the peak value decreases in the order of (200) crystal direction, (311) crystal direction, and (111) crystal direction. You can confirm that
従って、誘導加熱された無地部11bは、加熱されない無地部に比べて(220)結晶方向が減少するが、その代わり、追加的な方向性を有する(111)結晶方向、(200)結晶方向及び(311)結晶方向が増加する。また、誘導加熱された無地部11bは、輻射加熱された無地部に比べて、(111)結晶方向が増加したことを確認できる。結局、前記誘導加熱(IHA)された無地部11bは、誘導加熱によって結晶粒の結晶方向が変化し、物性が変化したことが分かる。 Therefore, the induction heated plain portion 11b has a (220) crystal orientation that is reduced compared to the unheated plain portion, but instead has an additional orientation (111) crystal orientation, (200) crystal orientation and (311) The crystal direction increases. Moreover, it can confirm that the (111) crystal | crystallization direction increased the plain part 11b by induction heating compared with the plain part heated by radiation. Eventually, it can be seen that the plain portion 11b that has been induction-heated (IHA) has changed the crystal orientation of the crystal grains due to induction heating, and has changed physical properties.
従って、本実施形態にかかる二次電池用電極板10のうち、集電体11の誘導加熱されないコーティング部11aと誘導加熱(IHA)された無地部11bは、相違する結晶粒及び物性特徴を有するようになり、延伸時に圧力偏差により発生する湾曲現象及び撓み現像を防止することができる。 Therefore, in the electrode plate 10 for the secondary battery according to the present embodiment, the non-inductively heated coating portion 11a of the current collector 11 and the non-inductively heated (IHA) plain portion 11b have different crystal grains and physical properties. As a result, it is possible to prevent the bending phenomenon and the bending development caused by the pressure deviation during stretching.
図4a乃至図4cは、本発明の実施例にかかる二次電池用電極板の集電体において、(220)結晶方向のピーク値に対する他の結晶方向でのピーク値の比を図示したグラフである。そして、表1には、図4a乃至図4cの各場合に対する結果がまとめられている。 4A to 4C are graphs illustrating the ratio of the peak value in the other crystal direction to the peak value in the (220) crystal direction in the current collector of the electrode plate for the secondary battery according to the embodiment of the present invention. is there. Table 1 summarizes the results for each case of FIGS. 4a to 4c.
先ず、図4aを表1と共に参照すると、加熱されない無地部の(111)結晶方向のピーク値を(220)結晶方向のピーク値で割った比(|(111)|/|(220)|)は、0.006乃至0.017の範囲を有すると測定された。また、前記比の平均値は0.011と測定された。 First, referring to FIG. 4a together with Table 1, the ratio (| (111) | / | (220) |) obtained by dividing the peak value in the (111) crystal direction of the unheated plain part by the peak value in the (220) crystal direction. Was measured to have a range of 0.006 to 0.017. The average value of the ratio was measured to be 0.011.
そして、輻射加熱された無地部の(111)結晶方向のピーク値を(220)結晶方向のピーク値で割った比(|(111)|/|(220)|)は、0.001乃至0.026と測定された。また、前記比の平均値は0.013と測定された。 The ratio (| (111) | / | (220) |) obtained by dividing the peak value in the (111) crystal direction of the plain portion heated by radiation by the peak value in the (220) crystal direction is 0.001 to 0 .026 was measured. The average value of the ratio was measured to be 0.013.
一方、本発明の実施例によって誘導加熱された無地部11bの(111)結晶方向のピーク値を(220)結晶方向のピーク値で割った比(|(111)|/|(220)|)は、0.051乃至0.222と測定された。また、前記比の平均値は0.134と測定された。 On the other hand, the ratio (| (111) | / | (220) |) of the peak value in the (111) crystal direction divided by the peak value in the (220) crystal direction of the plain portion 11b heated by induction according to the embodiment of the present invention. Was measured as 0.051 to 0.222. The average value of the ratios was measured to be 0.134.
前記結果を検討すると、本発明の実施例によって誘導加熱された無地部11bは、(111)結晶方向のピーク値を(220)結晶方向のピーク値で割った比(|111|/|220|)の平均値が0.134であって、加熱しない無地部の0.011や輻射加熱された無地部の0.013より増加したことを確認することができる。また、前記比が有する範囲も0.051乃至0.222と測定され、加熱されない無地部の比が有する0.006乃至0.017や、輻射加熱された無地部の比が有する0.001乃至0.026に比べて高くなったことを確認できる。結局、本発明の実施例によって誘導加熱された無地部11bは、メイン方向である(220)結晶方向のピーク値は既存に比べて減少し、(111)結晶方向のピーク値は既存に比べて増加して、結晶方向において多様性を確保するように物性が変化したので、湾曲現象及び撓み現像を改善することができる。 In consideration of the above results, the plain portion 11b induction-heated according to the embodiment of the present invention has a ratio (| 111 | / | 220 |) obtained by dividing the peak value in the (111) crystal direction by the peak value in the (220) crystal direction. ) Is 0.134, and it can be confirmed that it increased from 0.011 of the plain part not heated and 0.013 of the plain part heated by radiation. Further, the range of the ratio is also measured as 0.051 to 0.222, and the ratio of the unheated plain part is 0.006 to 0.017, and the ratio of the radiantly heated plain part is 0.001 to It can be confirmed that it is higher than 0.026. As a result, the plain portion 11b heated by induction according to the embodiment of the present invention has a peak value in the (220) crystal direction which is the main direction is reduced compared with the existing one, and a peak value in the (111) crystal direction is compared with the existing one. Since the physical properties are changed so as to ensure diversity in the crystal direction, the bending phenomenon and the flexural development can be improved.
一方、図4bを表1と共に参照すると、加熱されない無地部の(200)結晶方向のピーク値を(220)結晶方向のピーク値で割った比(|(200)|/|(220)|)は、0.020乃至0.029の範囲を有すると測定された。また、前記比の平均値は0.027と測定された。 On the other hand, referring to FIG. 4b together with Table 1, the ratio (| (200) | / | (220) |) of the peak value in the (200) crystal direction divided by the peak value in the (220) crystal direction of the unheated plain part is obtained. Was measured to have a range of 0.020 to 0.029. The average value of the ratio was measured to be 0.027.
そして、輻射加熱された無地部の(200)結晶方向のピーク値を(220)結晶方向のピーク値で割った比(|(200)/|(220)|)は、0.076乃至1.148と測定された。また、前記比の平均値は0.501と測定された。 The ratio (| (200) / | (220) |) obtained by dividing the peak value in the (200) crystal direction of the plain portion heated by radiation by the peak value in the (220) crystal direction is 0.076 to 1. It was measured as 148. The average value of the ratio was measured as 0.501.
一方、本発明の実施例によって誘導加熱された無地部11bの(200)結晶方向のピーク値を(220)結晶方向のピーク値で割った比(|200|/|220|)は、0.204乃至1.026と測定された。また、前記比の平均値は0.535と測定された。 On the other hand, the ratio (| 200 | / | 220 |) obtained by dividing the peak value in the (200) crystal direction of the plain portion 11b induction-heated according to the embodiment of the present invention by the peak value in the (220) crystal direction is 0. It was measured as 204 to 1.026. The average value of the ratio was measured to be 0.535.
前記結果を検討すると、本発明の実施例によって誘導加熱された無地部11bは、(200)結晶方向のピーク値を(220)結晶方向のピーク値で割った比(|200|/|220|)の平均値が0.535であって、加熱しない無地部の0.027や輻射加熱された無地部の0.501より増加したことを確認できる。即ち、本発明の実施例によって誘導加熱された無地部11bは、メイン方向である(220)結晶方向のピーク値は平均的に減少し、(200)結晶方向のピーク値は平均的に増加して、結晶方向において多様性を確保するように物性が変化したと判断されることができ、上述した湾曲現象及び撓み現像を改善することができる。 In consideration of the above results, the plain portion 11b induction-heated according to the embodiment of the present invention has a ratio (| 200 | / | 220 |) obtained by dividing the peak value in the (200) crystal direction by the peak value in the (220) crystal direction. ) Is 0.535, and it can be confirmed that it increased from 0.027 of the plain portion not heated and 0.501 of the plain portion heated by radiation. That is, in the plain portion 11b induction-heated according to the embodiment of the present invention, the peak value in the (220) crystal direction, which is the main direction, decreases on the average, and the peak value in the (200) crystal direction increases on the average. Thus, it can be determined that the physical properties have changed so as to ensure diversity in the crystal direction, and the above-described bending phenomenon and flex development can be improved.
一方、前記比が有する範囲は、0.204乃至1.026と測定され、加熱されない無地部の比が有する0.020乃至0.029よりは広いが、輻射加熱された無地部の比が有する0.076乃至1.148よりは狭いことが確認された。これは、結晶方向の方向性による結果であって、本発明の実施例によって誘導加熱された無地部11bの範囲が輻射加熱された場合に比べて狭い範囲の比(|(200)|/|(220)|)を有するが、平均値ではむしろ増加したので、全般的には(220)結晶方向のピーク値は減少し、(200)結晶方向のピーク値は増加したと評価されることができる。 On the other hand, the range of the ratio is 0.204 to 1.026, which is wider than the ratio of the unheated plain part 0.020 to 0.029, but has the ratio of the radiantly heated plain part. It was confirmed that it was narrower than 0.076 to 1.148. This is a result of the directionality of the crystal direction, and the ratio (| (200) | / |) of the narrow range compared with the case where the range of the plain portion 11b induction-heated according to the embodiment of the present invention is radiantly heated. (220) |), but the average value rather increased, so it is generally estimated that the (220) crystal direction peak value decreased and the (200) crystal direction peak value increased. it can.
一方、図4cを表1と共に参照すると、加熱されない無地部の(311)結晶方向のピーク値を(220)結晶方向のピーク値で割った比(|(311)|/|(220)|)は、0.182乃至0.199の範囲を有すると測定された。また、前記比の平均値は0.192と測定された。 On the other hand, referring to FIG. 4c together with Table 1, the ratio (| (311) | / | (220) |) obtained by dividing the peak value in the (311) crystal direction of the unheated plain portion by the peak value in the (220) crystal direction. Was measured to have a range of 0.182 to 0.199. The average value of the ratio was measured to be 0.192.
そして、輻射加熱された無地部の(311)結晶方向のピーク値を(220)結晶方向のピーク値で割った比(|(311)|/|(220)|)は、0.189乃至0.412と測定された。また、前記比の平均値は0.301と測定された。 The ratio (| (311) | / | (220) |) obtained by dividing the peak value in the (311) crystal direction of the plain portion heated by radiation by the peak value in the (220) crystal direction is 0.189 to 0 .412 was measured. The average value of the ratio was measured as 0.301.
一方、本発明の実施例によって誘導加熱された無地部11bの(311)結晶方向のピーク値を(220)結晶方向のピーク値で割った比(|(311)|/|(220)|)は、0.256乃至0.741と測定された。また、前記比の平均値は0.485と測定された。 On the other hand, the ratio (| (311) | / | (220) |) obtained by dividing the peak value in the (311) crystal direction of the plain portion 11b heated by induction according to the embodiment of the present invention by the peak value in the (220) crystal direction. Was measured as 0.256 to 0.741. The average value of the ratio was measured to be 0.485.
前記結果を検討すると、本発明の実施例によって誘導加熱された無地部11bは、(311)結晶方向のピーク値を(220)結晶方向のピーク値で割った比(|(311)|/|(220)|)の平均値が0.485であって、加熱しない無地部の0.192や輻射加熱された無地部の0.301より増加したことを確認できる。また、前記比が有する範囲も0.256乃至0.741と測定され、加熱されない無地部の比が有する0.182乃至0.199や、輻射加熱された無地部の比が有する0.189乃至0.412に比べて、全般的に高くなったことを確認できる。そして、前記比が有する範囲のうち、0.412より大きくて0.741以下の値は、本発明の実施例によって無地部11bを誘導加熱したことに起因したのである。また、本発明の実施例によって誘導加熱された無地部11bは、メイン方向である(220)結晶方向のピーク値は相対的に減少し、(311)結晶方向のピーク値は相対的に増加して、結晶方向において多様性を確保するように物性が変化したので、湾曲現象及び撓み現像を改善することができる。 In consideration of the above results, the plain portion 11b heated by induction according to the embodiment of the present invention has a ratio (| (311) | / |) obtained by dividing the peak value in the (311) crystal direction by the peak value in the (220) crystal direction. It can be confirmed that the average value of (220) |) is 0.485, which is increased from 0.192 of the plain portion not heated and 0.301 of the plain portion heated by radiation. Further, the range of the ratio is also measured as 0.256 to 0.741, the ratio of the non-heated plain part is 0.182 to 0.199, and the ratio of the radiantly heated plain part is 0.189 to Compared to 0.412, it can be confirmed that it has become generally higher. And the value which is larger than 0.412 and 0.741 or less in the range which the said ratio has originated in having induced the plain part 11b by the Example of this invention. Further, in the plain portion 11b heated by induction according to the embodiment of the present invention, the peak value in the (220) crystal direction which is the main direction is relatively decreased, and the peak value in the (311) crystal direction is relatively increased. In addition, since the physical properties are changed so as to ensure diversity in the crystal direction, the bending phenomenon and the bending development can be improved.
図5は、本発明の実施例にかかる二次電池用電極板の引張強度と延伸率の関係を従来の電極板と比較図示したグラフである。 FIG. 5 is a graph showing the relationship between the tensile strength and the stretch ratio of the electrode plate for a secondary battery according to the example of the present invention in comparison with a conventional electrode plate.
図5を参照すると、加熱されない無地部、輻射加熱(Radiation Heating Annealing、RHA)された無地部及び誘導加熱(Induction Heating Annealing、IHA)された無地部11bを有する電極板の引張強度及び延伸率をそれぞれ測定比較した。 Referring to FIG. 5, the tensile strength and elongation ratio of an electrode plate having an unheated plain part, a radiant heating (Radiation Heating Annealing, RHA) plain part, and an induction heating (Induction Heating Annealing, IHA) plain part 11 b are shown. Each measurement was compared.
先ず、加熱されない無地部は、基準1[mm]に対して約0.3[mm]乃至0.4[mm]が伸びる。即ち、加熱されない無地部の延伸率(elongation)は約30%乃至40%であることを確認できる。そして、前記無地部の引張強度(Tensile Strength)は約8[N]乃至9[N]である。即ち、加熱されない無地部は、延伸率が約40%以上に引張されず、40%以上に引張されるように応力を加える場合、塑性変形及び破壊される恐れができる。そして、加熱されない無地部は、図5に示すように、低い引張強度が印加される場合には引張され難い。 First, the unheated plain portion extends by about 0.3 [mm] to 0.4 [mm] with respect to the reference 1 [mm]. That is, it can be confirmed that the stretch ratio of the unheated plain portion is about 30% to 40%. And the tensile strength (Tensile Strength) of the said plain part is about 8 [N] thru | or 9 [N]. That is, the plain portion that is not heated cannot be stretched to about 40% or more, and may be plastically deformed and broken when stress is applied so as to be pulled to 40% or more. And the plain part which is not heated is not easily pulled when a low tensile strength is applied, as shown in FIG.
前記輻射加熱(Radiation Heating Annealing、RHA)された無地部は、基準長さ1[mm]に対して約0.5[mm]乃至0.8[mm]まで延伸されることができる。即ち、輻射加熱(RHA)された無地部の延伸率は、50%乃至80%であることを確認できる。そして、輻射加熱(RHA)された無地部は、引張強度が1.5[N]乃至2.5[N]である。前記輻射加熱(RHA)された無地部は、加熱されない無地部に比べて延伸率は高くて、引張強度は低い。即ち、前記輻射加熱(RHA)された無地部は、加熱されない(non-annealing)無地部に比べて小さい引張強度でも延伸できるので、延伸率が優れている。しかし、このような輻射加熱は、無地部だけでなく電極板を全体的に加熱するため、長い加熱時間が消耗され、無地部だけでなくコーティング部の物性までも変化させるようになる。よって、前記輻射加熱された電極板は、圧延時にコーティング部と無地部の間に印加される圧力差によって湾曲現象が発生する可能性がある。 The solid portion subjected to radiation heating (Radiation Heating Annealing, RHA) may be stretched to about 0.5 [mm] to 0.8 [mm] with respect to a reference length of 1 [mm]. That is, it can be confirmed that the stretch ratio of the plain portion that has been radiantly heated (RHA) is 50% to 80%. The plain portion that has been radiantly heated (RHA) has a tensile strength of 1.5 [N] to 2.5 [N]. The plain portion that has been radiantly heated (RHA) has a higher stretch ratio and a lower tensile strength than a plain portion that is not heated. That is, the radiant-heated (RHA) plain part can be stretched even with a lower tensile strength than the non-annealing plain part, and thus the stretch ratio is excellent. However, since such radiant heating heats not only the plain portion but also the electrode plate as a whole, a long heating time is consumed, and the physical properties of the coating portion as well as the plain portion are changed. Thus, the radiation-heated electrode plate may be bent due to a pressure difference applied between the coating portion and the plain portion during rolling.
一方、前記誘導加熱(IHA)された無地部11bは、基準長さ1[mm]に対して1[mm]乃至1.2[mm]延伸される。即ち、誘導加熱(IHA)された無地部11bの延伸率は、100%乃至120%であることが確認できる。そして、前記誘導加熱(IHA)された無地部11bは、引張強度が2[N]乃至3[N]である。この時、前記電極板10は、無地部11bのみ誘導加熱するので、コーティング部11aの引張強度及び延伸率は変化せず、誘導加熱された無地部11bと相違する。また、前記誘導加熱(IHA)された無地部11bは、延伸率が100%乃至120%であって、加熱されない(non-annealing)無地部や輻射加熱(RHA)された無地部の延伸率に比べて、遥かに優れていることを確認できる。そして、前記誘導加熱(IHA)された無地部11bは、加熱されない(non-annealing)無地部や輻射加熱(RHA)された無地部に比べて小さい引張強力でも延伸できるので、延伸率が優れていることが分かる。 On the other hand, the plain portion 11b that has been induction-heated (IHA) is stretched by 1 [mm] to 1.2 [mm] with respect to a reference length of 1 [mm]. That is, it can be confirmed that the stretch ratio of the plain portion 11b subjected to induction heating (IHA) is 100% to 120%. Then, the induction heated (IHA) plain portion 11b has a tensile strength of 2 [N] to 3 [N]. At this time, since the electrode plate 10 is induction-heated only in the plain portion 11b, the tensile strength and the stretch ratio of the coating portion 11a are not changed, and are different from the induction-heated plain portion 11b. The plain portion 11b that has been induction-heated (IHA) has a stretching ratio of 100% to 120%, and has a non-annealing plain portion or a radiant heating (RHA) plain portion. It can be confirmed that it is far superior. And, the plain portion 11b that has been induction-heated (IHA) can be stretched even with a lower tensile strength than a non-annealing plain portion or a radiantly heated (RHA) plain portion, so the stretch ratio is excellent. I understand that.
また、誘導加熱(IHA)された無地部11bは、輻射加熱(RHA)された無地部に比べてもっと大きい引張強力に耐えることができる。即ち、誘導加熱(IHA)された無地部11bは、輻射加熱(RHA)された無地部に比べて、延伸率が高いながら、もっと大きい引張強力に耐えることができる。 In addition, the plain portion 11b that has been subjected to induction heating (IHA) can withstand a greater tensile strength than the plain portion that has been subjected to radiation heating (RHA). That is, the plain part 11b that has been induction-heated (IHA) can withstand a greater tensile strength while having a higher stretch ratio than the plain part that has been subjected to radiation heating (RHA).
従って、電極板10の前記無地部11bのみ誘導加熱すると、前記無地部11bのみ物性が変化して延伸率が増加するので、前記電極板10の圧延時もコーティング部11aと無地部11bの間に印加される圧力差によって発生する湾曲現象を防止することができる。 Accordingly, when only the plain portion 11b of the electrode plate 10 is induction-heated, only the plain portion 11b changes in physical properties and increases the stretch ratio. Therefore, even when the electrode plate 10 is rolled, between the coating portion 11a and the plain portion 11b. It is possible to prevent the bending phenomenon caused by the applied pressure difference.
図6a及び図6bは、本発明の実施例にかかる二次電池用電極板の撓み偏差を図示したグラフである。 6A and 6B are graphs illustrating deflection deviations of the electrode plate for a secondary battery according to an embodiment of the present invention.
図6aと図6bは、加熱されない無地部と誘導加熱(IHA)された無地部11bを有する電極板での極板撓み偏差をそれぞれ図示したグラフである。ここで、極板撓み偏差は、圧延工程以後、無地部とコーティング部の間の撓み量を計算した標準偏差である。 FIGS. 6a and 6b are graphs illustrating the electrode plate deflection deviations in an electrode plate having a plain portion that is not heated and a plain portion 11b that is induction heated (IHA), respectively. Here, the electrode plate deflection deviation is a standard deviation obtained by calculating the deflection amount between the plain portion and the coating portion after the rolling process.
先図、図6aを参照すると、加熱されない無地部は、極板撓み偏差が約1.55[mm]と測定された。即ち、加熱されない無地部は、圧延工程で前記無地部と前記コーティング部の間に印加される圧力差により湾曲現象が発生したことを確認できる。 Referring to the previous figure, FIG. 6a, the plain plate unheated portion was measured to have an electrode plate deflection deviation of about 1.55 [mm]. That is, it can be confirmed that the uncured plain portion has undergone a bending phenomenon due to a pressure difference applied between the plain portion and the coating portion in the rolling process.
一方、図6bを参照すると、前記誘導加熱(IHA)された無地部11bは、極板撓み偏差が約0.67[mm]と測定された。即ち、前記誘導加熱(IHA)された無地部11bは、圧延工程で前記無地部11bと前記コーティング部11aの間に印加される圧力差によって発生する湾曲現象が減少したことを確認できる。 On the other hand, referring to FIG. 6b, the plain plate 11b subjected to induction heating (IHA) was measured to have an electrode plate deflection deviation of about 0.67 [mm]. That is, it can be confirmed that the induction heating (IHA) plain portion 11b has a reduced bending phenomenon caused by a pressure difference applied between the plain portion 11b and the coating portion 11a in the rolling process.
次に、本実施形態にかかる電極板が適用される二次電池に対して説明する。前記二次電池は、正極板と負極板及び正極板と負極板の間に位置するセパレータがジェリーロール形状に巻回される電極組立体を含んで形成される。前記電極組立体は、巻回形態を含む構造において一般的な二次電池に使用される電極組立体からなることができ、ここで詳細な説明を省略する。 Next, a secondary battery to which the electrode plate according to the present embodiment is applied will be described. The secondary battery includes a positive electrode plate, a negative electrode plate, and an electrode assembly in which a separator positioned between the positive electrode plate and the negative electrode plate is wound in a jelly roll shape. The electrode assembly may include an electrode assembly used for a general secondary battery in a structure including a winding form, and detailed description thereof is omitted here.
前記正極板は、本発明の実施例にかかる電極板10からなることができる。また、前記負極板も、本発明の実施例にかかる電極板10からなることができる。 The positive electrode plate may include the electrode plate 10 according to an embodiment of the present invention. Further, the negative electrode plate can also be composed of the electrode plate 10 according to the embodiment of the present invention.
前記正極板が本発明の実施例にかかる電極板で形成される場合、極板の湾曲現象及び撓み現像が減少する。よって、前記電極組立体は、より均一に巻回されることができる。 When the positive electrode plate is formed of an electrode plate according to an embodiment of the present invention, the bending phenomenon and the bending development of the electrode plate are reduced. Therefore, the electrode assembly can be wound more uniformly.
以上にて説明したことは、本発明の一実施形態にかかる電極組立体及びこれを有する二次電池を実施するための一つの実施例に過ぎないものであり、本発明は前記の実施例に限定されず、特許請求の範囲で請求するような本発明の要旨から外れることなく当該発明が属する技術分野で通常の知識を有する者であれば誰でも様々な変更実施が可能な範囲まで本発明の技術的精神があると言える。 What has been described above is only one example for carrying out the electrode assembly and the secondary battery having the electrode assembly according to one embodiment of the present invention, and the present invention is based on the above example. The present invention is not limited to the scope of the invention as claimed in the claims, and any person having ordinary knowledge in the technical field to which the invention belongs can make various modifications. It can be said that there is a technical spirit.
以上、添付図面を参照しながら本発明の好適な実施形態について詳細に説明したが、本発明はかかる例に限定されない。本発明の属する技術の分野における通常の知識を有する者であれば、特許請求の範囲に記載された技術的思想の範疇内において、各種の変更例または修正例に想到し得ることは明らかであり、これらについても、当然に本発明の技術的範囲に属するものと了解される。 The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to such examples. It is obvious that a person having ordinary knowledge in the technical field to which the present invention pertains can come up with various changes or modifications within the scope of the technical idea described in the claims. Of course, it is understood that these also belong to the technical scope of the present invention.
10 電極板
11 集電体
12 活物質
100 誘導加熱装置
110 巻出ローラ
120 ガイドローラ
130 移送ローラ
140 誘導加熱部
150 巻取ローラ
160 吸入部
170 冷却部
180 ダミーローラ
DESCRIPTION OF SYMBOLS 10 Electrode plate 11 Current collector 12 Active material 100 Induction heating device 110 Unwinding roller 120 Guide roller 130 Transfer roller 140 Induction heating unit 150 Winding roller 160 Suction unit 170 Cooling unit 180 Dummy roller
Claims (8)
前記集電体は、
一面に前記活物質が塗布されたコーティング部と、
前記コーティング部の長さ方向に沿って前記コーティング部の一側または両側に形成され、少なくとも四つの結晶方向を有する無地部と、を含み、
前記無地部を誘導加熱した後に圧延され、
前記無地部は、
(111)結晶方向、(200)結晶方向、(220)結晶方向及び(311)結晶方向を含んで形成され、
前記無地部は、前記誘導加熱により、誘導加熱されない前記コーティング部に比べて(220)結晶方向のX線回折分析におけるピーク値が減少し、(111)結晶方向、(200)結晶方向及び(311)結晶方向のX線回折分析におけるピーク値が増加し、
X線回折分析時、誘導加熱された無地部の(311)結晶方向のピーク値を(220)結晶方向のピーク値で割った比(|(311)|/|(220)|)は、0.256乃至0.741であり、
X線回折分析時、誘導加熱された前記無地部の前記(220)結晶方向でのピーク値に対する前記(111)結晶方向でのピーク値の比は、0.051乃至0.222であることを特徴とする、二次電池用電極板。 An electrode plate made of an aluminum current collector formed in a band shape and partially coated with an active material,
The current collector is
A coating portion having the active material applied on one surface;
A plain part formed on one or both sides of the coating part along the length direction of the coating part and having at least four crystal directions,
Rolled after induction heating the plain part,
The plain part is
(111) crystal direction, (200) crystal direction, (220) crystal direction and (311) crystal direction is formed,
The plain portion has a peak value in the X-ray diffraction analysis in the (220) crystal direction decreased by the induction heating as compared with the coating portion that is not induction heated , and the (111) crystal direction, (200) crystal direction, and (311). ) The peak value in the X-ray diffraction analysis in the crystal direction increases,
At the time of X-ray diffraction analysis, the ratio (| (311) | / | (220) |) obtained by dividing the peak value in the (311) crystal direction of the plain portion heated by induction by the peak value in the (220) crystal direction is 0. 256 to 0.741,
At the time of X-ray diffraction analysis, the ratio of the peak value in the (111) crystal direction to the peak value in the (220) crystal direction of the plain portion heated by induction is 0.051 to 0.222. An electrode plate for a secondary battery, which is characterized.
前記(220)結晶方向で最も大きいピーク値を有することを特徴とする、請求項1に記載の二次電池用電極板。 The plain part is
The electrode plate for a secondary battery according to claim 1, wherein the electrode plate has the largest peak value in the (220) crystal direction.
前記(220)結晶方向でのピーク値に対する前記(311)結晶方向でのピーク値の比が0.412より大きくて0.741以下であることは前記誘導加熱に起因することを特徴とする、請求項1に記載の二次電池用電極板。 The plain part is
The ratio of the peak value in the (311) crystal direction to the peak value in the (220) crystal direction is greater than 0.412 and 0.741 or less due to the induction heating, The electrode plate for secondary batteries according to claim 1.
前記誘導加熱のための誘導加熱装置は、 The induction heating apparatus for the induction heating is
活物質コーティング部と無地部を有する電極板を巻き出す巻出ローラと、 An unwinding roller for unwinding an electrode plate having an active material coating portion and a plain portion;
前記電極板を移送するガイドローラと、 A guide roller for transferring the electrode plate;
前記ガイドローラから移送された前記電極板の無地部を誘導加熱する誘導加熱部と、 An induction heating unit for induction heating the plain portion of the electrode plate transferred from the guide roller;
前記ガイドローラから移送される前記電極板を巻き取る巻取ローラと、を含んでなることを特徴とする、請求項1に記載の二次電池用電極板。 The secondary battery electrode plate according to claim 1, further comprising a winding roller that winds up the electrode plate transferred from the guide roller.
前記正極板または負極板のうち選択された少なくとも何れか一つは、請求項1乃至請求項4のうち選択された何れか一つにかかる電極板で形成されたことを特徴とする、二次電池。 At least one selected from the positive electrode plate and the negative electrode plate is formed of an electrode plate according to any one of claims 1 to 4, wherein the secondary plate is a secondary electrode. battery.
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EP2296209B1 (en) | 2012-11-21 |
CN101997108B (en) | 2014-03-19 |
US20110039138A1 (en) | 2011-02-17 |
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CN101997108A (en) | 2011-03-30 |
KR20110017761A (en) | 2011-02-22 |
EP2296209A1 (en) | 2011-03-16 |
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